It's applied to all software (SDLC cycle) release management and roll-outs, not just only in qlik sense.

After you done with SIT/DEV app and its respective data are moved to UAT environment, where user Acceptance Testing will be done. so you can share the app/UAT URL with your users/client for the testing. if they found any data discrepancy/export/GUI issue ask them to raise it via JIRA kind system and let technical team will fix & test that again. after that you can inform to users end to do the re-test again with the Fix. Finally after every testing is passed the app is moved to Production.

Note: also you can prepare a User Manual Document: It Will explain the step by step walk through for user

(i.e: how to open the report, how to create Storytelling, bookmark, how to export, how to filter the data etc) for your app.